/*******************************************************************************
 * Copyright (c) Jonathan Buck - jonbuck16@gmail.com
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    jonbuck16@gmail.com - initial API and implementation
 *******************************************************************************/
package net.jonbuck.tassoo.persistence.ui.handler;

import net.jonbuck.tassoo.persistence.dao.TassooDao;
import net.jonbuck.tassoo.persistence.dao.TassooDaoImpl;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;

/**
 * 
 * 
 * @since 1.0.0
 */
public class UndoHandler extends AbstractHandler implements IHandler {

	/**
	 * 
	 */
	public Object execute(ExecutionEvent event) throws ExecutionException {

		TassooDao tassooDao = TassooDaoImpl.getInstance();

		if (tassooDao.isLoaded()) {
			tassooDao.getEditingDomain().getCommandStack().undo();
		}

		return null;
	}

}
